1) I picked concert etiquette because it's something that I'm really passionate about and something that I think everyone should consider when going to a concert. Music is a huge part of my life, and I love live music so much. I always have so much fun at concerts, and I want everyone else to have a good experience too.
2) I want to make sure I'm interested in whatever topic I choose, because I think that's when I deliver my best work. Another thing I like to have in mind is if there's enough information on the topic to be able to give a speech about it. If I have to speak for a longer time it's best that I choose a topic that has a lot of information on it.